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Smooth Brain

The term "Smooth Brain" refers to someone unintelligent, or an action that could be classified as unintelligent. Neuroscientists believe that the more folds your brain has, the more surface area neurons have, thus, leading to higher intelligence. However, without these folds, there won't be as large of a surface area for your neurons, which leads to idiocy, or Smooth Brainedness.
"This buttery smooth brained idiot stuck a goddamn fork in the power outlet."
"That was the most smooth brained sentence I've ever stumbled across in my 25 years on this planet."
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smooth bore

An adult without any teeth. Usually great at providing head.
Buster's new boyfriend is a smooth bore. Not a tooth in his head. He gives the best gummies.
by sncf69 May 4, 2022
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Smooth N.I.P

A legendary Rapper in the Southern California Industry. After releasing his album A.I.P he was crowned King of the Industry. He was faced with much backlash from other notable artists like CWC and Lil TJ. This caused Smooth N.I.P to go into an indefinite Hiatus. We await his return.
Smooth N.I.P is the king
Smooth N.I.P sucks
by The Industry Review October 7, 2022
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Smooth Brain Society

A society that includes only people with smooth, silky brains who consider themselves as "smart", Except for the Head and co-head that are just heads instead of brains.
Example:
"Hey, I'm Sean from the Smooth Brain Society"
by eman laer ruoy esu t'nod November 8, 2022
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Smooth Criminal

What Michael Jackson called "little Michael". What he fantasised about doing, but couldn't. Read the lyrics of the song - he wouldn't keep asking if Annie was okay (Oakley?) if she were dead, now would he?
Jenny: I was hit by a Smooth Criminal last night.
Sally: I thought you were walking funny today.
by Cool4Katz April 14, 2023
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Smooth Brain Moron

When you reply with something smart to a idiot streamer. Famously used by a British world of tanks player that cannot get good dpg's in overpowered tanks.
"What a smooth brain moron" - Will (Quickybaby) Frampton
by PotatoCrusher May 21, 2023
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Smooth Criminal

The act of inserting your thumb into your girlfriends rectum during sex then brag about it.
You been hit by, you been struck by a "Smooth Criminal."
by WhacksHoff November 24, 2023
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